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Convert Milligram to Scruple (mg to s) instantly with accurate, readable results.
Use our Mass Unit Converter to convert between grams, kilograms, pounds, ounces, and other weight units instantly. Designed for cooking, science, fitness, and engineering needs, this unit conversion tool offers accurate results between metric and imperial systems. Whether you’re tracking body weight, measuring ingredients, or handling heavy machinery, our mass unit conversion calculator has you covered.
Milligram (mg) — a small SI unit of mass
It is defined as one thousandth of a gram, or one millionth of a kilogram, the SI base unit for mass. Used worldwide for measuring very small masses in medicine, nutrition, chemistry, laboratory work, supplements, and precise product labeling.
- Symbol: mg
- System: SI unit for mass; decimal submultiple of the kilogram
- Exact relations: 1 mg = 0.001 g = 0.000001 kg = 1000 µg
- Imperial equivalents (derived from 1 lb = 0.45359237 kg exactly): 1 mg ≈ 0.000035274 oz ≈ 0.00000220462 lb
- Typical examples: a medicine dose ~200 mg; a vitamin tablet ~500 mg; a small grain of salt less than 1 mg.
Scruple (℈) — an apothecaries’ unit of mass equal to 20 grains
It is defined as exactly 20 grains, or one third of an apothecaries’ dram; since 1 grain = 64.79891 mg exactly, 1 scruple = 1.2959782 g exactly. Used historically in pharmacy, medicine, and apothecaries’ weight systems, but now mostly encountered in historical references.
- Symbol: ℈
- System: Apothecaries’ unit for mass
- Exact relations: 1 scruple = 20 gr = 1/3 apothecaries’ dram = 1.2959782 g
- Metric equivalents: 1 scruple = 1.2959782 g ≈ 0.00129598 kg
- Typical examples: historical medicine recipes may list doses in scruples; 3 scruples equals 1 apothecaries’ dram; 1 scruple is a little heavier than 1 gram.